class Vue {
  constructor(name) {
    this.name = name
    new this.Watcher(this.name + 'holo').say()
  }
  Watcher = class {
    constructor(name) {
      this.name = name
    }
    say() {
      console.log('我是watcher里面的' + this.name)
    }
  }
}
const vue = new Vue('pika')
